Smoke-stack



(No Model.)

G. GRAY.

SMOKE STACK.

No. 264,076. f Patented Sept. 12, 1882.

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UNITED I STATES PATENT OFFICE.

GORHAM GRAY 013 BOSTON, MASSACHUSETTS.

SMOKE-STACK.

SPECIFICATION forming part of Letters Patent No. 264,076, dated September 12, 1882.

. Application filedMarch 15, 1882. (No model.)

To all whom it may concern:

Be it known that l, GORHAM GRAY, of Boston, county of Sufiolk, State of Massachusetts, have invented an Improvement in Smoke- Stacks, of which the following description, in connection with the accompanying drawings, is a specification.

My invention relates to a smoke-stack or uptake especially intended for locomotives, and has for its object to raise the column of smoke high up into the atmosphere, so that it will not enter the car-windows, and also to prevent thecinders from being scattered upon the train. The invention consists in the employment of two or more spirahpassages in the lower part of the stack, by means of which the smoke and other products of combustion when forced therethrough will acquire a rotary or spiral movement, and the different columns issuing from the said spiral passage into the upper cylindrical portion of the stack will combine in a single column, which. ascends with a'spiral or gyratory movement for a long distance before the compact column thus formed is broken by the action of the currents of air striking against it. The spiral passages are nearly flat, or have asmall angular inclination to a horizontal plane, so that the'ciuders, in striking against the sides of the said passages, will mostly recoil and fall into the lower part of the smoke-box, and-such cinders as pass through the passage will be reduced in size, so as to be lifted with the column of smoke and products of combustion. I

Figure 1 is a side elevation of a smoke-stack embodying this invention, portions of the side walls being broken away; and Fig.2, an under side view thereof. t

The lower portion, a, of the stack has two or more channels or tubes, b, containing a spiral partition, 0, having a small pitch or inclination to the horizontal plane. The said partition thus forms in the tube 1) two smaller spiral passages, through which the smoke and other products of combustion are forcibly carried by the action of the exhaust-steam from the cone in the usual manner. In being thus forcibly d riven through the spiral passages in the channels b the products of combustion will acquire a spiral or gyratory movement, as indicated by the arrows, and in issuing from the said channels into the upper portion, 6, of the stack the difi erent columns will combine, forming a single colnmn, f, which is very compact, and

will ascend unbroken for a considerable distance, so as to afford no incon-venience to the train of cars passing beneath. Many of the cinders, especially the large ones, in striking against the flat sides of the partition 0, will recoil therefrom and fall at the sides of and be-- low the cone (1, as indicated by the arrows 4. and those which pass through the stack will be so com minuted as to be readily raised with the column of smoke, so as to offer no inconvenience. The spiral partitions c terminate some distance below the tops of the channels b, as indicated by the dotted line g, leaving a free passage in the said channels above the said line.

The space between the channels b and the outer cylinder or casing, a, of the stack is proyided with diaphragms h, preventing the passage of products of combustion through the said space. a

The exhaust-cone will preferably beprovided with two orifices or nozzles, one in line with each of the channels 1), instead of the psual single central orifice.

I claim-- .In a smoke-stack, the channels I), provided with spiral partitions c, substantially as and for the purpose described.

In testimony whereof I have signed my name to this specification in the presence of two snoscribing witnesses.

conHAii GRAY.

Witnesses Jos. P. LIVERMORE, B. J. NoYEs. 

